// 给你一个字符串 date ，它的格式为 Day Month Year ，其中：
//     Day 是集合 {"1st", "2nd", "3rd", "4th", ..., "30th", "31st"} 中的一个元素。
//     Month 是集合 {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"} 
//     中的一个元素。
//     Year 的范围在 ​[1900, 2100] 之间。

// 请你将字符串转变为 YYYY-MM-DD 的格式，其中：
//     YYYY 表示 4 位的年份。
//     MM 表示 2 位的月份。
//     DD 表示 2 位的天数。

// 示例 1：
// 输入：date = "20th Oct 2052"
// 输出："2052-10-20"

// 示例 2：
// 输入：date = "6th Jun 1933"
// 输出："1933-06-06"

// 示例 3：
// 输入：date = "26th May 1960"
// 输出："1960-05-26"

// 提示：
//     给定日期保证是合法的，所以不需要处理异常输入。

/**
 * @param {string} date
 * @return {string}
 */
var reformatDate = function(date) {
	let ob = {
		"Jan": '01',
		"Feb": '02',
		"Mar": '03',
		"Apr": '04',
		"May": '05',
		"Jun": '06',
		"Jul": '07',
		"Aug": '08',
		"Sep": '09',
		"Oct": '10',
		"Nov": '11',
		"Dec": '12',
	}
	let arr = ["1st","2nd","3rd","4th","5th","6th","7th","8th","9th","10th","11th","12th","13th","14th","15th","16th","17th","18th","19th","20th","21st","22nd","23rd","24th","25th","26th","27th","28th","29th","30th","31st"];
	date = date.split(' ');
	let t = 0;
	for(let i = 0; i < 31; i++) {
		if (arr[i] === date[0]) {
			t = i + 1;
		}
	}
	t < 10? '0' + t: t + '';
	return date[2] + '-' + ob[date[1]]; + '-' + t;
};

console.log(reformatDate("20th Oct 2052"))


